lld/Common/Timer.cpp

   1 //===- Timer.cpp ----------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lld/Common/Timer.h"
  10 #include "lld/Common/ErrorHandler.h"
  11 #include "llvm/Support/Format.h"
  12 #include <ratio>
  13
  14 using namespace lld;
  15 using namespace llvm;
  16
  17 ScopedTimer::ScopedTimer(Timer &t) : t(&t) {
  18   startTime = std::chrono::high_resolution_clock::now();
  19 }
  20
  21 void ScopedTimer::stop() {
  22   if (!t)
  23     return;
  24   t->addToTotal(std::chrono::high_resolution_clock::now() - startTime);
  25   t = nullptr;
  26 }
  27
  28 ScopedTimer::~ScopedTimer() { stop(); }
  29
  30 Timer::Timer(llvm::StringRef name) : total(0), name(std::string(name)) {}
  31 Timer::Timer(llvm::StringRef name, Timer &parent)
  32     : total(0), name(std::string(name)) {
  33   parent.children.push_back(this);
  34 }
  35
  36 void Timer::print() {
  37   double totalDuration = static_cast<double>(millis());
  38
  39   // We want to print the grand total under all the intermediate phases, so we
  40   // print all children first, then print the total under that.
  41   for (const auto &child : children)
  42     if (child->total > 0)
  43       child->print(1, totalDuration);
  44
  45   message(std::string(50, '-'));
  46
  47   print(0, millis(), false);
  48 }
  49
  50 double Timer::millis() const {
  51   return std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(
  52              std::chrono::nanoseconds(total))
  53       .count();
  54 }
  55
  56 void Timer::print(int depth, double totalDuration, bool recurse) const {
  57   double p = 100.0 * millis() / totalDuration;
  58
  59   SmallString<32> str;
  60   llvm::raw_svector_ostream stream(str);
  61   std::string s = std::string(depth * 2, ' ') + name + std::string(":");
  62   stream << format("%-30s%7d ms (%5.1f%%)", s.c_str(), (int)millis(), p);
  63
  64   message(str);
  65
  66   if (recurse) {
  67     for (const auto &child : children)
  68       if (child->total > 0)
  69         child->print(depth + 1, totalDuration);
  70   }
  71 }